These were designed to encourage two-handed use and to explore reflections and visions of your surroundings in different colours.
The windows come in red, yellow and blue and positioning them together will allow you to explore colour mixing.
The handles are made to give open handed grasp and if you cannot manage that, you can place your hand in the space and manoeuvre the frame in that way.
The four holes enable you to hang the frames at any angle to give easy visual access.