Abstract: An illusion creating device comprises a support structure having a support edge encircling an aperture and a flat element. An elastic membrane is supported on the support edge and is stretched over the flat element to a degree wherein a supporting segment of the membrane underlies a portion of the element and supports it. The flat element is viewable through the membrane so as to appear to be disposed on top of the membrane. Pressing the stretched membrane over the flat element causes the element to be released from the membrane, thereby creating the illusion that the flat element passed through the membrane.

Abstract: A selectively operable switch, separate and distinct from the conventional on/off switch, is electrically connected into the fan control circuit of a photographic enlarger, for selective operation, as by the foot of the operator, to turn off the fan, and thus eliminate any vibrations caused by same, for certain operations, as when making an internegative; and for turning the fan back on after such operations to provide cooling air to protect the lenses and other components within the enlarger head. Alternatively, the fan and its drive motor are housed at a location removed from the enlarger head with a flexible tube connecting the outflow from the fan to the enlarger head to provide the air for cooling the enlarger lenses and other components housed within the enlarger head.