In the old days, the "gaper" was the most eye-catching signboard among the many signs in the streetscape.
Where you see the "gaper", there was the pharmacy or drugstore.
In addition to all kinds of medicines and drinks, other stimulants such as coffee, tea, sugar and tobacco were also sold.
The outstretched tongue with pill on it speaks for itself, if you showed the 'back of your tongue' to the doctor, he could see what your illness was and put a healing pill on your tongue.
The "gaper" comes from a pharmacy in Zierikzee, located on De Dam.