Periscope

At hairdresser's

State-money box

Kaleidoscope

A mirror or a window?

A glance in the distancel

Universal mirrors

Mirage

Three-dimensional goat

Bubble sphere

Penguins

Fibre-optic cable

Entomologist's microscope

Telescope

A magic eye

Battery stall

Colourful tops

Sunglases

Svarowski's sphere

Counterfeit banknotes

Chromatic glasses

CD spectrometer

Soap bubbles

Invisible beams