Abstract: Apparatus and associated methods relate to a portable-device presentation system having a substantially-planar substrate; a first clamp coupled to the substrate; and a second clamp slidably coupled to the substrate, each of the first and second clamps having respective opposing contact surfaces that have substantially no curvature along axes substantially parallel to the substantially-planar substrate at a contact elevation above the substantially-planar substrate, wherein when a user slides the second clamp to a maximum display-size position and lays a display device on the substantially-planar substrate between the first clamp and the second clamp, the user may then secure the display device to the presentation system by sliding the second clamp to sandwich the display device between the two respective opposing contact surfaces and securing the second clamp using a hand-operated securing member. In various embodiments, a presentation system may secure portable display devices of many different sizes.

Abstract: Apparatus and associated methods relate to a portable-device presentation system having a substantially-planar substrate; a first clamp coupled to the substrate; and a second clamp slidably coupled to the substrate, each of the first and second clamps having respective opposing contact surfaces that have substantially no curvature along axes substantially parallel to the substantially-planar substrate at a contact elevation above the substantially-planar substrate, wherein when a user slides the second clamp to a maximum display-size position and lays a display device on the substantially-planar substrate between the first clamp and the second clamp, the user may then secure the display device to the presentation system by sliding the second clamp to sandwich the display device between the two respective opposing contact surfaces and securing the second clamp using a hand-operated securing member. In various embodiments, a presentation system may secure portable display devices of many different sizes.

Abstract: Apparatus and associated methods relate to a holder with a slot for laterally receiving and extracting a thin substrate into a recessed access area where a major surface of the substrate may be accessed while the edges of the substrate are substantially retained against vertical egress. In an illustrative example, the thin substrate may be paper or other material suitable for marking with a writing instrument. The access area in some examples may be defined by an opening in the holder through which a central area of the major surface of the substrate may be accessed. In an illustrative embodiment, the holder may be attached to a child's high chair to attract the child's attention and substantially confine the use of writing instruments to the paper disposed within the recessed access area.